Digital Clock with Temperature & Humidity Display

DSD Project

This project implements a Digital Clock using an Arduino Uno, DS3231 Real-Time Clock, TM1637 4-digit 7-segment display, and a DHT11 temperature & humidity sensor.
A push button allows the user to toggle between:

• ⏰ Time (HH:MM)
• 🌡️ Temperature (°C)
• 💧 Humidity (%)

The TM1637 display is used for its simple interface and minimal wiring, while the DS3231 ensures highly accurate timekeeping. The DHT11 sensor adds environmental monitoring to enhance the functionality of the project.

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🔧 Features

• Real-time clock with precise DS3231 RTC
• Temperature and humidity display using DHT11
• TM1637 display with brightness control
• Push button toggling between different display modes
• Non-blocking code using millis() for smooth operation
• Easy to build, ideal for students and hobbyists

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🧰 Components Used

• Arduino UNO
• TM1637 4-Digit Display
• DS3231 RTC Module
• DHT11 Temperature & Humidity Sensor
• Push Button + 10kΩ resistor
• Jumper Wires
• USB Cable / Power Supply

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🔌 Circuit Connections

TM1637

TM1637 Pin	Arduino Pin
VCC	5V
GND	GND
DIO	D7
CLK	D6

DS3231 RTC

DS3231 Pin	Arduino Pin
VCC	5V
GND	GND
SDA	A4
SCL	A5

DHT11 Module

DHT11 Pin	Arduino Pin
VCC	5V
GND	GND
DATA	D2

Push Button

• One leg → D3
• Other leg → GND
• 10k resistor → D3 to 5V (pull-up)

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▶️ How It Works

1. The Arduino reads time from the DS3231.
2. It reads temperature and humidity from the DHT11.
3. The display shows time, temperature, or humidity based on the push button.
4. The output updates every second without freezing the processor.

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🧪 Future Improvements

• Add alarm functionality
• Auto-brightness using LDR
• Bluetooth or WiFi updates
• Weather forecast using online APIs

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